Dry concrete - When can I raise the flag?

[Turbo_Tail]

I have cast a foundation for a 9m flagpole with the following dry concrete:

https://husfasad.se/product/lakka-torrbetong-s100/

The foundation is a pipe with a diameter of about 30+cm and a height of 140+cm.

I can't find any information on curing/drying time. How long can one expect to wait before raising the flagpole and hoisting the flag?

 

[Stringfellow Hawke]

If you do not know or cannot find out the curing time, wait 28 days.

 

[tveksamt]

https://www.lakka.fi/wp-content/uploads/2015/10/kuivabetoni-s100_sv.pdf

 

[Turbo_Tail]

If you don't know or can't find the curing time, wait 28 days.

[link]

"A layer of about 10 millimeters cures in one day (at 18-20 °C)."

So, for the two who have replied so far in the thread, after how many days do I raise the flag? North wind and 15 meters per second.

 

[Turbo_Tail]

Mocking people is easy. Harder to give a definitive answer?

 

[Plupp 173289]

Curing time is affected by a lot of factors. If you look around the forum, you'll see many threads about it. 28 days is to achieve >95% strength. The first 5 days are the most critical. Initially, the concrete hardens, but that's not the same as it being cured/hardened and having achieved sufficient strength.

 

[mexitegel]

I recall that concrete reaches about 50% strength after 3 days, about 75% after 7 days, and nearly 100% after 28 days.

I would have waited closer to two weeks.

 

[Turbo_Tail]

Curing time is affected by a lot. If you look around the forum, you'll see many threads about it. 28 days is to reach >95% strength. The first 5 days are the most critical. Initially, the concrete hardens, but that's not the same as it being set/cured and having sufficient strength.

Yes, I know. But I asked a very specific question with specific measurements and a specific objective and want opinions on when the objective can be implemented. Snarky and general answers aren't helpful in this context, are they?

 

[Turbo_Tail]

I seem to recall that concrete reaches about 50% strength after 3 days, about 75% after 7 days, and nearly 100% after 28 days.

I would have waited closer to two weeks.

Thank you. That is what I have in mind.

 

[hsd]

I was advised not to pour into pipes but to pour the concrete into the dug hole when I bought the greenhouse, for a better grip in the ground. The recommendation was because it had happened that stormy weather lifted the entire greenhouse with concrete blocks. The curing time was five days, but we assembled the greenhouse the next day and it has held. A flagpole offers other forces, so wait five days before raising.

 

[Turbo_Tail]

I was advised not to cast in pipes but to pour the concrete directly into the dug hole when I bought the greenhouse, for a better grip in the ground. The recommendation was because it had happened that stormy weather lifted the entire greenhouse with concrete blocks. The curing time was five days, but we mounted the greenhouse the day after and it has held. A flagpole presents different forces, so wait five days before raising it.

I really buy the reasoning. But in this case, it was easier to dig down a rest-pipe and it is oversized for a 9m flagpole, so I'm not worried.

 

[C.Lundin]

Yes, I know. But now I asked a very specific question with specific measurements and a specific goal and want opinions on when the goal can be implemented. Sarcastic answers and general answers are of no use in this context, are they?

If we don't get any info, it's not possible to give anything other than general answers. We have no idea, for example, how cold it is. Or if you cast it into the ground or on the ground to place it later. Or how much water you used. Or what temperature the water you used was.

General questions get general answers, and interpreting that as "sarcastic" is just unnecessary.

Mexitegel's answer is sensible but should be taken with a grain of salt as there are many factors at play.

 

[Turbo_Tail]

Without any info, we can only give general answers. We have no idea how cold it is, for example. Or if you poured it in place or on the ground to later place it. Or how much water you've used. Or the temperature of the water you used.

General questions get general answers, and to interpret it as "snarky" is just unnecessary.

Mexitegel’s answer is valid but should be taken with a grain of salt since many factors are involved.

You are right. But in this case, I think it's clear that you have buried an upright cylinder vertically with given measurements and used the amount of water specified by the manufacturer. The temperature is a typical Swedish/Finnish autumn. The temperature of the water should be irrelevant as the amount needed is negligible and, therefore, not measurable.

 

[Turbo_Tail]

I experience that the forum mostly consists of people who want to mess with each other instead of helping. In the thread, I formulate a very concrete question, and very few try to provide an answer.

 

[jonaserik]

I find that the forum mostly consists of people who want to mess with each other instead of helping.

You have cast a fitting for a flagpole into a tube, if it is a paper tube, wait 2 weeks before putting weight on it, if it is a plastic tube, the wait is at least 4 weeks. The water must have a chance to leave the concrete.